Table 6. Comparison of Various Adsorbents with PESHA for the Removal of the Reactive Dye from Aqueous Media.
| adsorbent | adsorption capacity (mg g–1) | reference |
|---|---|---|
| apatitic octocalcium phosphate | 61.65 | El-Boujaady et al., 2011 |
| apatitic tricalcium phosphate | 40.85 | El-Boujaady et al., 2011 |
| calcium deficient hydroxyapatite | 51.08 | El-Boujaady et al., 2016 |
| chitosan | 133.28 | Karmaker et al., 2015 |
| chitosan coated magnetite nanoparticles | 47.62 | Kalkan et al., 2012 |
| hydroxyapatite | 50.25 | Barka et al.57 |
| poultry eggshell derived apatite | 127.9 | this study |